covered, covert

Covered or covered is the past tense ( yesterday, or some time ago ) of "cover", meaning to provide with a lid or blanket, or figuratively, with an excuse or alibi--
She covered the pot so the stew would stay warm.
He looked cold, so she covered him with a blanket.
I covered for him the last time he was late, but I won't do it again.

Covered is also the past tense of "cover", meaning to coat with something--
One can of paint covered the whole wall.
Look at the dog! He's covered in mud!

Covered is also the past tense of "cover", meaning to protect or shelter--
The tree covered the side of the house, and protected it from the wind.
The umbrella was so big that it covered both of them.

Covered is also the past tense of "cover", meaning to have withing scope or range--
Our new reporter covered the story.

Covert or covert means clandestine or secret--
This is a covert operation; you'll need a security clearance.

Covert also means a shelter or hiding place, such as a thicket where game animals might hide--
They watched from a covert, hoping a deer would pass by.
The rabbit ran into a covert, where even the dog can't get at him.

Now that you know that, you can say--
"His article covered the story of a some covert arms deals."